習題121、二維矩陣轉置
a=[
[1,2,3],
[4,5,6],
[7,8,9],
[10,11,12]
]
result_list=[]
for i in range(3):
list_inner=[]
for l in a:
list_inner.append(l[i])
result_list.append(list_inner)
print(result_list)
習題122、刪除二維矩陣的第1列
#conding=utf-8
a=[
[1,2,3],
[4,5,6],
[7,8,9],
[10,11,12]
]
result_list=[]
for l in a:
temp_list=[]
for i in [1,2]:
temp_list.append(l[i])
result_list.append(temp_list)
print(result_list)
習題123、把一個列表偶數位作爲key,奇數位作爲value,轉換成字典
方法1:
a=[1,2,3,4,5,6]
b={}
for i in range(0,len(a),2):
k=a[i]
v=a[i+1]
b[k]=v
print(b)